Means for folding in wrapping material at the end of an approximately cylindrical article

ABSTRACT

The invention is concerned with wrapping of a cylindrical article, such as a roll, for example a paper roll. Hence particularly, the invention relates to folding the end of the wrapping while rotating the wrapped cylinder. According to the invention there is provided a rotatable folding body having a helical groove or land surface extending around the periphery of said body and during the rotation of said folding body, abutting the wrapping material at the end of said wrapped cylinder so as to fold in said material at said end substantially continuously. The helical groove or land surface may have a varying pitch and/or width, for example decreasing towards one end of the folding body.

United States Patent 833,896 10/1906 Rexroth etal.

Karl Gustav Kohler Folkungavagen, Swede Feb. 12, 1969 May 4, 1971Aktiebolaget Nordstroms Libanor Stockholm K., Sweden E MEANS FOR FOLDINGIN WRAPPING MATERIAL AT TIIE END OF AN APPROXIMATELY cYLINDRIcAL ARTICLE3 Claims, 2 Drawing Figs.

U.S.Cl

Int.Cl .l B65b49/l2 Field of Search 53/3 80,

References Cited UNITED STATES PATENTS Inventor Appl. No. Filed PatentedAssignee 3,411,269 11/1968 Karr 3,412,654 ll/1968 McCandless PrimaryExaminer-Theron E. Condon Assistant Examiner-Robert L. SpruillAttorney-Albert M. Parker ABSTRACT: The invention is concerned withwrapping of a cylindrical article, such as a roll, for example a paperroll. Hence particularly, the invention relates to folding the end .ofthe wrapping while rotating the wrapped cylinder. According to theinvention there is provided a rotatable folding body having a helicalgroove or land surface extending around the periphery of said body andduring the rotation of said folding body, abutting the wrapping materialat "the end of said wrapped cylinder so as to fold in said material atsaid end substantially continuously. The helical groove or land surfacemay have a varying pitch and/or width, for example decreasing towardsone end of the folding body. I

MEANS FOR FOLDING IN WRAPPING MATERIAL AT THE END OF AN APPROXIMATELYCYLINDRICAL ARTICLE The present invention relates to a means for foldingin wrapping at the end of a cylindrical article or a roll, comprisingmembers for rotating the article or roll and a folding member arrangedat the end of said article or roll.

The main object of the invention is to provide a simple and serviceablemeans for folding in the outer wrapping towards the end of a roll whichis being wrapped.

Characteristic of the invention is that the folding member comprises arotatable body engaging the wrapping at said end by means of a helicalsurface, which during substantially the entire rotation of the body isarranged to abut the wrapping material in order to fold it in at saidend substantially continuously.

According to a suitable embodiment of the invention the helical bodyconsists of a roller having a helical groove extending around theperiphery thereof to receive an extension of the wrapping projectingfrom the outer surface of the roll and fold it in towards the end of theroll.

The outer surface of the folding member is situated close to andsubstantially parallel to the end of the roll and the folding member forthe wrapping is oriented in such a way that the entrance of the groovesubstantially coincides with a part of the circumference of the roll.

The invention will be described more fully in the following withreference to'the accompanying drawings, in which FIG. 1 shows a sideview of the means, and

FIG. 2 a view from above of FIG. 1.

The numeral 1 designates a roll, for example a paper roll, which is madeto rotate in the direction of the arrow A by means of two drivingmembers 2 in contact with the outer surface of the roll 1. The roll 1 isprovided with an outer wrapping which is somewhat wider than the rollitself and thus has an extension 3 projecting at least over one end ofthe roll 1. In order to fold in the extension 3 towards the end of theroll a folding member is arranged consisting of a substantiallyroller-shaped body 4 which is rotatably joumaled on a shaft 5. On itsouter surface the folding member 4 is provided with a helical groove 6having a relatively wide entrance 7 situated at the circumference of theroll 1 to initially receive and guide the extension 3. The width of thegroove 6 decreases successively towards the center of the roll. Thus,the folding member 3 is so arranged in relation to the end of the rollthat its outer surface substantially contacts the end of the roll and issituated substantially perpendicular to the longitudinal direction ofthe roll 1. The axis of the folding member 4 can be set at variousangles in relation to the tangent of the roll at the folding point.

With the means shown in the drawings the extension 3 is fed continuouslyinto the entrance 7 of the groove due to the rotation of the roll 1 inthe direction of the arrow A and, due to counterrotation of the foldingmember, the extension is folded in towards the end of the roll inclockwise or counterclockwise direction depending on whether the foldingbody or folding member for the wrapping is right-hand or left-handthreaded. The distance between the outer surface of the folding memberand the end of the roll can thus easily be adapted to the thickness ofthe outer wrapping used in each case so that the folded extension can bepressed or urged against the end of the roll to the desired extent. Thefolding member 4 for the wrapping may also be designed in the form ofhelically running flanges or cams. Its outer surface may possibly beconical and the pitch of the helical surface (groove or cam) may varyfrom one end to the other. If a conical shape is selected it ispreferred to decrease the pitch towards the end of the roll which hasthe largest diameter. Also the width of the helical groove may vary,preferably by decreasing the width towards said end with the largestdiameter.

lclaim:

1. Means for folding in wrapping at the end of a cylindrical article ora roll, comprising members to rotate the roll and a folding body arra'ned at the end of the roll, said folding body comprising a rotata leroller or cylinder with a helical groove extending around the peripheryof said roller or cylinder to receive an extension of the wrappingprojecting from an outer surface of the roll and to fold said extensionin towards the end of the roll, said body being arranged to abut thewrapping material during substantially an entire rotation of the body inorder to fold said wrapping material in at said end substantiallycontinuously.

2. Means according to claim 1, wherein the width of the groove decreasestowards the center of the roll.

3. Means according to claim 2, wherein the folding body has varyingdiameter along its length.

1. Means for folding in wrapping at the end of a cylindrical article ora roll, comprising members to rotate the roll and a folding bodyarranged at the end of the roll, said folding body comprising arotatable roller or cylinder with a helical groove extending around theperiphery of said roller or cylinder to receive an extension of thewrapping projecting from an outer surface of the roll and to fold saidextension in towards the end of the roll, said body being arranged toabut the wrapping material during substantially an entire rotation ofthe body in order to fold said wrapping material in at said endsubstantially continuously.
 2. Means according to claim 1, wherein thewidth of the groove decreases towards the center of the roll.
 3. Meansaccording to claim 2, wherein the folding body has varying diameteralong its length.